RU2170202C2 - Tubular conveyor with suspension belt - Google Patents

Abstract

FIELD: conveyor transport. SUBSTANCE: proposed tubular conveyor with suspension belt has support frame with closed guides secured on frame at both sides of conveyor and made in form of single pipes enclosing drive and end drums, and endless conveyor belt with uniformly spaced roller suspensions secured on belt sides for movement along guides. In places where belt is truncated to form tube, its sides, from side of working surface, are joined with each other and are bent towards non- working surface of belt to provide reliable closing, with radius of belt side bending found from equation r = E_H•t/2G_-1, where r is belt side bending radius, m; E_H is belt modulus of elasticity, MPa; t is belt thickness, m; G_-1 is endurance limit of belt, MPa; radius of conveyor tube in place of belt turning to form the tube is found from equation R = (B-r(π-2α)-2L_H)/2(π-α), where R is conveyor tube radius, m; B is belt width; m; r is belt side bending off radius, m; π- is transcendental number equal to 3.141; α is angle defining belt bending-off radius, rad; L_H is width of belt side overlapping zone, m. Distance between axial lines of tubular guides in places where belt is turned to form tube is found from equation L_on= 2(R+A)•sinβ, where L_on is distance between axial lines of tubular guides, m; A is distance from belt cover plate in place of attachment of roller suspension to axial line of tubular guide, m; β is angle defining distance between axial lines of tubular guides, deg. EFFECT: simplified design, reduced consumption of power and cost of belt used in conveyor. 3 cl, 6 dwg

Description

 The invention relates to a tubular conveyor with a hanging tape.

 Known tubular belt conveyor, in which to give the tape a tubular shape used garland-shaped supports, consisting of six rollers located along the length of the conveyor with a certain pitch, and the sides of the tape overlapped relative to each other [1].

 The disadvantages of this conveyor are the design complexity and great resistance to the movement of the tape rolled into a tube inside the garland-shaped roller suspensions.

 Also known is a tubular conveyor with a hanging tape [2], the belt of which serves as a load-carrying member, and a steel rope is used as a traction member. Structurally, the tape is made with tides on the sides, with the help of which when it is rolled into a pipe, the friction connection of the tape with the traction rope is carried out. In this case, the tape is suspended on the support rollers, motionlessly located with a certain step along the length of the conveyor.

 The disadvantages of this conveyor are the complexity of the design of the tape and its high cost, as well as the difficulty of joining such tapes. In addition, a significant drawback of this conveyor, in which the tape is suspended on a stationary roller bearings for the protrusions on its sides, is the increased wear of the tape in places of its contact with the rollers.

 Closest to the claimed technical solution is a tubular conveyor with a hanging tape [3], which includes metal sections made in the form of triangular frames, along the edges of the load-carrying belt of which running rollers are rigidly fixed, moving on the working and idle branches of the conveyor along the guide elements. At the same time, the tape is both a traction and a load-carrying body, and traction is transmitted to it with the help of a horizontally located drive drum. The tape is tensioned at the end sections where the guiding elements diverge, as a result of which the tape takes a flat shape.

The disadvantages of this conveyor are:
- the presence of slots along the belt between its sides and overlays, to which the running rollers are rigidly attached (especially if the conveyor path is indirect in the vertical or horizontal plane);
- the appearance of additional sliding friction forces when the rollers move along the guides due to different peripheral speeds on the concave working surface of the rollers, which leads to intensive wear of the contacting elements of the conveyor;
- the possibility of jumping off the rollers from the guides.

 In addition, in this conveyor, the guides along which the rollers move are made up of four independent sections: the working, idle and two transitional (in the area of the drums), which complicates their design and does not ensure the continuous movement of the tape.

 The aim of the invention is the elimination of the spillage of cargo through the cracks during its transportation, reducing the resistance during movement of the belt, increasing the reliability of the conveyor and the durability of its contacting elements.

 This goal is achieved by the fact that the claimed invention contains a tubular conveyor with a hanging tape, including a support frame with closed guides fixed to it on both sides of the conveyor, made in the form of single pipes and enveloping the drive and end drums, and an endless conveyor belt, on the sides of which uniformly fixed roller suspensions rolling along the guides installed on both sides of the conveyor, and the geometric parameters of the conveyor are selected in such a way that there is no disclosure the seam in the places of tape folding into the pipe, its sides from the side of the working surface are closed to each other and to ensure reliable closure, they are bent towards the non-working surface of the tape with a radius of curvature of contact of the sides of the tape.

где B - ширина ленты, м;
r - радиус отгиба бортов ленты, м;
π - трансцендентное число равное, 3, 141;
α - угол, определяющий радиус отгиба ленты, рад;
L_н - ширина зоны перекрытия бортов ленты, м.According to the invention, the radius of the conveyor pipe is determined by the ratio:

where B is the width of the tape, m;
r is the radius of the limb of the sides of the tape, m;
π is a transcendental number equal to 3, 141;
α is the angle defining the radius of the bend of the tape, rad;
L _n - the width of the zone of overlap of the sides of the tape, m

где E_н - модуль упругости выбранной ленты, МПа;
t - толщина выбранной ленты, м;
G_-1 - предел выносливости выбранной ленты, МПа.The bending radius of the tape is selected from the condition of the fatigue strength of the tape. According to experimental data, the radius of bending of the sides of the tape is recommended to be determined by the ratio:

where E _n is the elastic modulus of the selected tape, MPa;
t is the thickness of the selected tape, m;
G _-1 - endurance limit of the selected tape, MPa.

По экспериментальным данным величину L_н рекомендуется принимать в пределах L_н = (2...2,5)•t.The angle determining the radius of the bending of the tape is determined by the ratio:

According to experimental data, the value of L _{n is} recommended to be taken within L _n = (2 ... 2.5) • t.

The distance between the axial lines of the tubular guides is determined by the ratio:
L _on = 2 (R + A) • sinβ, (4)
where A is the distance from the lining on the tape at the place of attachment of the roller suspension to the axial line of the tubular guide, m;
β is the angle defining the distance between the axial lines of the tubular guides, deg.

 The value of A is determined constructively in the design of conveyors.

где В_н - ширина накладки в месте крепления подвески к ленте, м.The angle β is determined by the ratio:

where In _n - the width of the lining at the place of attachment of the suspension to the tape, m

The value of V _n is determined constructively when designing conveyors.

The technical and economic analysis of the comparison of the tube conveyor company "Saarberguerke AG Grobe Ensdorf" Germany and the proposed design for the transportation of waste rock (γ = 1.7 t / m ³ ) and granular ammonium nitrate (γ = 1.1 t / m ³ ) at identical parameters of the conveyor shows that in our case the necessary width of the tape is reduced. According to the first example, 1600 mm versus 1850 mm.

 The energy consumption of the conveyor is reduced, the required number of rollers and their mass, and the total cost of the conveyor is also significantly reduced.

 When the roller suspension moves along the pipe, contact stresses sharply decrease, each roller having a cylindrical surface moves independently of the other without slipping along the guides, so there is no wear of the rolling surfaces. Suspended tape moves uniformly without jerking that occurs when the rollers “jam”, which contributes to the durability of the tape in places of its attachment with pendants.

 The practical result of the invention is that the selection of the geometric parameters of the conveyor in such a way that there is no opening of the seam at the points of contact of the sides of the tape will simplify the design of the tubular conveyors, reduce their energy consumption, reduce the cost of the tape and the number of required rollers, as well as the application in the proposed conveyor four-roller suspensions will increase the service life of the supporting elements of the conveyor and the reliability of its operation.

 A tubular conveyor with a hanging tape is made as follows.

 In FIG. 1 shows a side view of the conveyor; in FIG. 2 - the same, top view; in FIG. 3 - section of the conveyor at the end drum (section AA in Fig. 1); in FIG. 4 and 5 are, respectively, sections of the conveyor at transitional sections, in which the cargo branch of the belt changes its shape from flat to pipe-shaped (sections BB and BB in Fig. 1); in FIG. 6 is a cross section of the upper part of the conveyor at its main working section, where the cargo branch of the tape is completely folded into the pipe (section GG in Fig. 1).

 The tubular conveyor with hanging tape includes a support frame made in the form of two longitudinal beams 2 mounted on racks 1 and placed on both sides of the conveyor (see Fig. 1). On the supporting frame using transverse beams 3, brackets 4 and strips 5 (see Fig. 6) mounted rails 6, made in the form of closed and elongated along the conveyor pipes (see Fig. 2). On the drive 7 and end 8 drums (see Fig. 1) there is an endless tape 9, to the sides of which (see Fig. 6), pendants 10 are attached uniformly along the length of the tape using plates with spikes and bolts, each of which is equipped with four rollers eleven.

 Near the drums 7 and 8 (see Fig. 2), having a cylindrical shape, the guides 6 are made with bends to the side of the conveyor axis, as a result of which the four-roller suspensions 10 are spaced apart by a distance almost equal to the width of the belt 9 (see Fig. 3 ) To give the lower branch of the tape 9 reverse grooves (excluding the accumulation of cargo spills, dust and other undesirable particles on the tape), paired support rollers 13 are mounted under it using height-adjustable supports 12 (see Fig. 4). To bring the tape 9 into motion on the shaft of the drive drum 7 mounted drive 14 (see Fig. 2).

 The conveyor works as follows.

 When rotating by means of the drive 14 of the driving drum 7, the tape 9 is given translational motion (to the left in Fig. 1), as a result of which the tape 9 carries four-roller suspensions 10 attached to its sides, which, with the help of the support rollers 11 placed on them, roll freely the upper and lower branches of the tube-shaped guides 6 (see Fig. 3). At the same time, on each of the sections of the conveyor route, two rollers 11 of each suspension are supporting, and the other two rollers 11, covering the tube-shaped guide 6 from below, prevent the suspensions 10 from jumping off the guides 6.

 The independent operation of each roller from each other and the possibility of bending the tube-shaped guides 6 in the vertical and horizontal planes allow you to change the direction of the conveyor path in space in any direction.

Approaching the conveyor loading point (i.e., in the region of the end drum 8) in connection with the rails 6 approaching each other, the tape 9 acquires a groove (see Fig. 4), necessary for a more complete loading of the belt and elimination of this responsible section of the conveyor spills of transported cargo. After loading the tape 9, in connection with the further rapprochement of the guides 6, the tape 9 first acquires a shape close to the pipe (see Fig. 5), and then a completely tube-shaped form (see Fig. 6), where the sides of the tape 9 are tight pressed against each other, and the distance between the guides 6 on the cargo branch of the conveyor becomes minimal (see size L _on in Fig. 6).

In FIG. 6 also shows the geometric parameters of the conveyor, determining the reliability of the overlap of the seam in places where the sides of the tape touch. Moreover, some geometric parameters (A, B _n ) of the conveyor are selected constructively during the design of the conveyor, and other parameters (r, L _n ) are determined experimentally using the above relations (1), (3), (4) and (5) .

 The technical and economic advantage of the claimed invention lies in the fact that in the proposed tubular conveyor with hanging tape, the structure is simplified and its energy consumption is reduced, the cost of the tape used and the number of necessary rollers are reduced, as well as their total weight and the cost of the conveyor. In addition, the reduction of contact stresses in the support elements and the movement of the rollers without slipping increases the service life of the support elements, belts and the reliability of the conveyor as a whole.

Sources of information
1. Inventions of the countries of the world. Abstract information. Issue 50, N 18, p. 18, M., 1988.

 2. Perten Yu.A. Steep inclined conveyors. - L .: Engineering, 1977, p. 216, fig. 65, p. 139.

 Z. Perten Yu.A. Steep inclined conveyors. - L .: Engineering, 1977, p. 216, fig. 64 p. 138.

Claims (3)

1. A tubular conveyor with a hanging belt, including a support frame with closed guides fixed on both sides of the conveyor, made in the form of single pipes and enveloping the drive and end drums, and an endless conveyor belt, on the sides of which roller suspensions are evenly fixed with the possibility of their movement along the guides, characterized in that in places of coagulation of the tape into the pipe of its side on the side of the working surface are closed to each other and to ensure a reliable closure bent towards the idle overhnosti tape radius bending sides tape, defined by the relation

where r is the radius of the limb of the sides of the tape, m;
E _n - the elastic modulus of the tape, MPa;
t is the thickness of the tape, m;
G _-1 - the endurance of the tape, MPa. 2. The conveyor according to claim 1, characterized in that in the places where the tape is rolled into a pipe, the radius of the conveyor pipe is determined by the ratio

where R is the radius of the conveyor pipe, m;
In - the width of the tape, m;
r is the radius of the limb of the sides of the tape, m;
π is a transcendental number equal to 3.141;
α is the angle defining the radius of the bend of the tape, rad;
L _n - the width of the zone of overlap of the sides of the tape, m 3. The conveyor according to claim 1 or 2, characterized in that in the places where the tape is rolled into a pipe, the distance between the axial lines of the tubular guides is determined by the ratio
L _on = 2 (R + A) • sinβ,
where L _on is the distance between the axial lines of the tubular guides, m;
A is the distance from the lining on the tape at the place of attachment of the roller suspension to the axial line of the tubular guide, m;
β is the angle defining the distance between the axial lines of the tubular guides, deg.

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